Device for the dispersion of insecticide powders



DEVICE FOR THE DISPERSION OF INSECTICIDE POWDERS Fil ed Nov; 9, 1954 A av INVENTOR. AR-ruRb R169 Row/{H United States Patent DEVICE FOR THE DISPERSION OF INSECTICIDE POWDERS Arturo Riba Rovira, Barcelona, Spain Application November 9, 1954, Serial No. 467,849

2 Claims. (Cl. 219-19) The invention relates to a device for exterminating insects by means of the regular and continuous dispersion of a suitable powdered insecticide.

The device according to the invention consists essentially of a vessel or receptacle of suitable material, shape and size, provided with appropriate means for securing it to a wall, hanging it from a ceiling, or for resting it on a horizontal surface, and in the center of which receptacle is mounted a metallic capsule inside which is mounted an infrared ray transmitter consisting of a refractory filter body and an internal resistance having its leads connected to a plug or socket mounted at the base of the device.

A small pilot lamp is connected in the lead-in circuit to indicate when the device is in operation.

In the annular chamber bounded by the central capsule and by the wall of the receptacle is placed the insecticide powder to surround the wall of the capsule. When the device is connected to a source of current supply and the current is switched on, the transmitter comes into action and the capsule wall is heated, thus warming up the surrounding air and giving rise to eddies which entrain the particles of insecticide, making them rise and scattering them throughout the room or the like where the device is placed.

The device is diagrammatically illustrated by way of example in the accompanying drawings, in which:

Figure 1 shows a perspective view of an embodiment of the device according to the invention, and

Figure 2 is a longitudinal sectional view of the device of Fig. 1.

Referring to the drawings, the device consists of a vessel 1 made of any suitable material which, in this case, is of bell-shape, having its narrower base part at the bottom. The vessel 1 is mounted on an insulated base 2 provided with a fitting 3 for securing the device to a vertical wall. Joined to the receptacle-or independently from itis an internal metallic capsule 4 enclosing an infra-red ray transmitter which consists of a cone of refractory filter material 5 and a heating element (not shown in the drawings) connected through electrical conductors 6 to a plug or socket 7.

Under the base 2 there is formed a cavity to receive a small pilot lamp 8, electrically connected in the feed-in circuit, to indicate when the device is in operation. A suitable translucent switch button 9 is positioned around the pilot lamp.

Between the concentric walls of the vessel 1 and of the capsule 4 is formed an annular chamber which is filled with the insecticide powder 10 to a determined level.

This device operates as follows:

When the plug 7 is connected in the circuit, current is automatically fed in, and the element in the transmitter 5 becomes heated, thus giving rise to heat radiation which is transmitted to the insecticide powder 10. Owing to the difference in density, the heat from the transmitter creates eddies in the surrounding air which entrain the powder particles upwards, scattering them throughout the room in a regular, slow but eflicient manner and insuring in this way, that they permeate every nook and corner.

As it will be clearly seen, the warm air is the only agent for entraining the powder particles, the air current necessary for the volatilization being ensured by the continuous heating through the transmitter.

The pilot lamp 9 remains switched on whilst the device is operating, and is extinguished when the current to the transmitter is cut off.

The construction illustrated in the drawings has been designed for wall mounting, but it is understood that it can also be adapted for standing on tables or for hanging from the ceiling. The method of operation is the same in all cases, the volatilization of the powder being attained in the manner hereinbefore described.

I claim:

1. A device for dispersing insecticide powder in the dry state comprising, in combination, a vessel having an inverted bell-shaped wall for containing an insecticide powder; a casing mounted to extend vertically in the vessel in spaced relation to the wall so as to form between itself and the wall an annular space for the insecticide powder; a base for said vessel formed with a chamber therein; a refractory heating element mounted on said base to extend upwardly in said casing; means mounted in said base for connecting said element to a source of current supply whereby upon heating of the casing the air surrounding the casing is heated causing the same to rise and creating in turn an air current in the space between the bell-shaped wall of said vessel and the casing, the dry insecticide powder contained in the space being carried into the heated air rising from said vessel causing distribution of dry insecticide powder throughout the surrounding atmosphere; and a pilot lamp mounted in said chamber and connected in the electrical circuit, so that when the circuit is completed a visual indication is given through a translucent panel closing an opening in said chamber that the device is in operation.

2. A device for dispersing insecticide powder in the dry state comprising, in combination, a vessel having an inverted bell-shaped wall for containing an insecticide powder; a casing mounted to extend vertically in the vessel in spaced relation to the wall so as to form between itself and the wall an annular space for the insecticide powder; a base for said vessel formed with a fitting thereon; a refractory heating element mounted on said base to extend upwardly in said casing; means mounted in said base for connecting said element to a source of current supply whereby upon heating of the casing the air surrounding the casing is heated causing the same to rise and creating in turn an air current in the space between the bell-shaped wall of said vessel and the casing, the dry insecticide powder contained in the space being carried into the heated air rising from said vessel causing distribution of dry insecticide powder throughout the surrounding atmosphere; and electrical plugs mounted on said fitting to extend at right angles to the longitudinal axis of the vessel to enable the device to be plugged in to sockets formed in a vertical wall whereby current is supplied to the device.

References Cited in the file of this patent UNITED STATES PATENTS 1,982,358 Smith Nov. 27, 1934 2,483,993 Becker Oct. 4, 1949 2,611,068 Wellens Sept. 16, 1952 2,616,024 Laibow Oct. 28, 1952 2,668,993 Bair Feb. 16, 1954 2,692,327 Avrigan Oct. 19, 1954 

